Hypodermic needle



Nov. 29, 1949 K. s. TYDlNGs ET Al.

HYPODERMIC NEEDLE Filed April 2, 1948 /zIl Patented Nov. 29, 1.949

HYPODERMIC NEEDLE Kenneth S. Tydings and Helen M. Tash, Long Beach, N. Y.

Application April 2, 1948, Serial No. 18,567

(Cl. 12S-220) 4 Claims.

' This invention relates to injecting apparatus, such as hypodermic needles, and has for its principal object to provide a construction in which the injecting needle is hermetically enclosed in the fiuid lled ampul to be ready for use without sterilization, and so that the ampul with its needle may be thrown away after it has been used once.

Another object is to provide means which will facilitate the refilling of the ampul during treatment.

With these and other objects in view that will become apparent from the detailed description of the invention, the latter consists of the novel combination, arrangement and construction of parts as will be hereafter fully described and defined in the appended claims.

In the drawings, which constitute part of this specification, and in which similar reference characters denote corresponding parts;

Fig. 1 is a longitudinal section of the injecting apparatus;

Fig. 2 an enlarged section of the rear part of the ampul;

Fig. 3 a similar section of a modiled construction of the ampul; and

Fig. 4 an enlarged section of the rear part of the latter.

Referring in detail to the drawing, Il denotes the usual tubular container or ampul made of glass or any other suitable material, and which is hermetically closed at its ends by rubber closures or plugs II, I2. The rear plug is slidable within the ampul and adapted to act as a plunger, as will be presently described, while the plug I2 in the forward end of the ampul is xed in position- This forward plug, for the purposes hereinafter explained, is made hollow to form a chamber which at its inner side is open as at |21. The hollowed part of this plug is extended, as at I2, to project outwardly from the forward end of the ampul and terminates in a nipple like tip |2 The injecting hollow needle I3, at its rear open end is formed with or has fixed to it a bead I4 having a passage Illa one end of which opens into the ampul and the other end into the needle. The bead I4 may engage a cavity I Ia provided on the inner face of the rear closure whereby the needle may be centered within the ampul. The forward open end of the needle projects into the front plug I2 and when forced forwardly by the plzunger or plug II, is adapted to pierce the tip I c.

Any suitable means may be used to hold the ampul in position and to exert pressure onthe rear plunger in operating the injecting needle. In the present example a cylindrical or tubular holder I5 is used, through whose forward open end I5a projects the tip |23 of the hollow plug I2.

The object of making the front closure hollow and extending the hollowed part I2a beyond the front end of the ampul is to render it possible to refill the ampul or add some fluid into it during the treatment without the necessity of substituting a fresh ampul and needle. To accomplish this end, the holder I5 at its forward end may be provided with a peripheral aperture I5b which is open to the extended hollow part |2 of the plug I2. By placing an auxiliary injecting apparatus I1 so that its forward closure or plug will coincide with or engage said aperture |5b, additional fluid from said auxiliary apparatus may be injected by means of the auxiliary needle |`|a which will pierce the periphery of the main plug I2.

In the modification shown in Fig. 3, the container or ampul I0 is divided by a movable partition I8 into two compartments I0, Illb, each adapted to receive a different uid that may be needed to be injected in one operation. As in the first modification, the forward end of the ampul is closed by the stationary closure or plug I2 and the rear end of the ampul is closed by the movable closure II. The needle I9 in this modification is provided with a peripheral opening I9 in addition to its rear end opening. The distance between the peripheral opening and said end opening is so admeasured that when said closure reaches the partition I8 the opening |98 will have passed from the rear into the forward compartment.

By these means when successive injections of two different fluids in a single operation are desired, the plunger is advanced, forcing the fluid to enter the needle rst from the rear compartment Illa and when the plunger has reached the partition I8 the opening I9a has passed through said partition I8, forcing the fluid from the forward compartment ||lb to enter the needle.

Instead of the bead I4, the rear end of the needle is hook-shaped, as at |91, with the open end projecting away from the plug Il so that when the plunger il has reached the partition I8, it will bear against said partition and thereby close said open end.

What we claim is:

1. In an injecting apparatus of the character described, a tubular container or ampul for the uid to be injected, a closure xed in the forward end of said ampul and a closure slidably mounted in the rear end of said ampul, a hollow injecting needle extending throughout the length of the ampul and adapted, when said needle is 'wwadly by' 'sli'dbleilsure, to pierce the fdrwad closure, 1and a mein` her on the rear open end Iof said needle adapted to bear against said rear closure and formed with a passage communicating at its outer eind, with the ampul and at its'inner end with said needle.

2. In an injecting apparatu icdig" t claim 1 in which the rear closure on its inn'r face is formed with a cavity to engage said member and thereby hold said needle centered within the container.

3. In an injecting apparatus according to claim 1 in which said frward -losu' is hollow, opening into' the rpul at its inner 'end-..1 and whose outer end projects outwardly trom said container to p'ermit its being pierced pipherally by 'an auxiliary injecting instrument for refilling purposes.

4. In an injecting apparatus of the character described, a tubular container or ampul for the fiuid to be injected, a closure xed at the forward end of said ampul and having a portion with a hollow closed off passageway projecting outwardly of the said forward end to permit piercing of said portion peripherally by an auxiliary injecting instrument, a closure slidably mounted in the rear end of said ampul, and having a cavity on its inner face, a hollow injecting needle extending throughout the length of the ampul and adapted when said needle is pushed forwardly'A by said s lidable* closure, d to pierce the forward clvsrf, and a head A"'r tlivlear open end of the needle 'closing said 'ei'd and adapted to'engage in said cavity and thereby hold said rieedle centered within said container, said bead hayin'ga passageway communicating at its outer end with the ampul and at its inner end with 'said needle;

KENNETH S. TYDINGS. HELEN M. TASH.

Nmpei- Name l nate, 1,767,304 Morton .-1 an 24; 193'@ 1,929,616 viafa 1 -1 'oen 1'0, 1933 

